HP StorageWorks XP Remote Web Console Software - Manual (Page 12)

12 Performance Control XP
Procedure for one-to-one connections between HBAs and ports
Figure 1 shows an example of a network where each host bus adapter is connected to only one port on
the disk array. (Henceforth, this network is referred to as network A.) Host bus adapters and disk array
ports are connected directly, rather than through hubs and switches.
Figure 1 Network A (one-to-one connections between HBAs and ports)
In this example, setting up Performance Control XP requires the following major steps:
1. Set the priority of disk array ports. Use the Port tab of the Performance Control pane to specify the
priority of each port on the disk array.
In network A, ports 1A and 1C are connected to high-priority production servers. Port 2A is connected
to a low-priority development server. Therefore, ports 1A and 1C should be given high priority, and
port 2A should be given low priority.
Figure 2 shows a portion of the Performance Control pane. Prio. indicates that the port is given high
priority, and Non-Prio. indicates that the port is given low priority.
NOTE: Throughout this chapter, prioritized port refers to a high-priority port and non-prioritized
port refers to a low-priority port.
Figure 2 Priority specified in the Performance Control pane
2. Monitor traffic at ports. Obtain statistics about traffic at each port on the disk array.
Auto LUN provides two types of traffic statistics: I/O rate (number of I/Os per second) and transfer rate
(amount of data transferred between a host and disk array). When you view traffic statistics in the
Performance Control pane, select the I/O or transfer rate. The Port-LUN tab of the Performance Monitor
pane displays a line graph illustrating changes in traffic.
Figure 3 shows changes in the I/O rate for the three ports (1A, 1C, and 2A). At first the I/O rate for
ports 1A and 1C was approximately 400 IO/s and the I/O rate for port 2A was approximately 100
IO/s. However, the I/O rate for port 2A gradually increased and the I/O rate for ports 1A and 1C
decreased, lowering the performance of the high-priority production servers. As network administrator,
you might want to maintain the I/O rate for prioritized ports 1A and 1C at 400 IO/s. To do this, set an
upper limit to the I/O rate for port 2A.